﻿/************************************************************************

   Extended Silverlight Toolkit

   Copyright (C) 2010-2012 Xceed Software Inc.

   This program is provided to you under the terms of the Microsoft Public
   License (Ms-PL) as published at http://extendedsilverlight.codeplex.com/license

   Please purchase a commercial version of this toolkit if you are using
   it in a commercial product. The commercial versions support the project,
   and also include more features for each control, priority support,
   source code, updates, removed watermark, and a proprietary license.

   Visit http://xceed.com and follow @datagrid on Twitter.

  **********************************************************************/

using System.Collections;
using System.Collections.Generic;
using System.Linq;

namespace Xceed.Silverlight.Data
{
  internal class ListDataItemEnumerable : IEnumerable<RawDataItem>
  {
    internal ListDataItemEnumerable(
      IEnumerable<RawDataItem> dataItems,
      int inlineCount,
      int totalCount )
    {
      m_dataItems = ( dataItems != null )
                      ? dataItems
                      : Enumerable.Empty<RawDataItem>();
      this.InlineCount = inlineCount;
      this.TotalCount = totalCount;
    }


    #region InlineCount Property

    internal int InlineCount
    {
      get;
      private set;
    }

    #endregion

    #region TotalCount Property

    internal int TotalCount
    {
      get;
      private set;
    }

    #endregion


    internal static ListDataItemEnumerable Empty()
    {
      return ListDataItemEnumerable.Empty( 0 );
    }

    internal static ListDataItemEnumerable Empty( int totalCount )
    {
      return new ListDataItemEnumerable( Enumerable.Empty<RawDataItem>(), 0, totalCount );
    }


    #region IEnumerable<RawDataItem> Members

    IEnumerator IEnumerable.GetEnumerator()
    {
      return this.GetEnumerator();
    }

    public IEnumerator<RawDataItem> GetEnumerator()
    {
      return m_dataItems.GetEnumerator();
    }

    #endregion


    #region Private Fields

    private IEnumerable<RawDataItem> m_dataItems;

    #endregion
  }
}
